Prospective data Collection Patients with a major head injury (initial GCS 3-12), have been considered for enrollment in the BTO study.The prospective arm of the BTO study has 52 patients enrolled. Screening and Enrollment was complete on June 30, 2007. These patients are participating in long term follow up at 6, 12 and 24 months post injury for assessment of qualitative and quantitative outcomes. Completion of patient follow up will be in June 2009.